| | January 31 Polar Vortex Blast | | | |
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| | | Downtown Chicago this week. Image via AP Photo/Nam Y. Huh/The Conversation. | | | | | | | | | |
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| | | Light pillar, a moon pillar, moon dogs | View larger at EarthSky Community Photos. | On Tuesday morning, Darlene Tanner in Alberta, Canada captured a light pillar, moon pillar and halo around the moon - and the 2 moon dogs on either side of the moon - all caused by ice crystals drifting in the air. Plus, she caught the moon poised to slide past 3 planets before sunup this week. And there's more, here. Thanks, Darlene! | | | | |
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| | Polar vortex 2019 photos and videos | Cloud streets and lake-effect snow stretch across the scene on Tuesday, as frigid Arctic winds blew over the US Great Lakes. Natural-color satellite image via NASA Earth Observatory. More images here. | | |